59 



Stat. iS. 7°28'.2S., 1 1 5° 24 .6 E. 10 18 M. Fine grey mud. 2 Spec. 



Stat. 52. 9°3'.4S., ii9°56'.7E. 959 M. Globigerina ooze. 2 Spec. 



Stat. ^6. 4°22'.i S., ii8°i6'.9E. 2029 M. Fine grey mud (Globigerina). i Spec. 



Stat. 300. io°48'.6S., I23°23'.i E. 918 M. Fine grey mud. I Spec. 



The description of this species is very short, the author says only : " A brillantly nacreous 

 species, ornamented with two spiral rows of conical tubercles and four smooth carinae on the 

 base, exclusive of a faintly granulated one which bounds the umbilicus". The specimen is from 

 a depth of 738 fathoms, in the Gulf of Manaar. As no measurements are given, and the rather 

 rude figure showed some differences with the "Siboga"-shells, I hesitated to identify them, though 

 the ''Siboga"-specimens seemed to be very nearly allied. Mr. Smith after comparing them with 

 an authentic specimen, declared them to be the same species. A specimen of about the same 

 diameter as the figure is higher in proportion, the measurements of the largest specimen with 8 

 whorls are: Alt. 22, diam. maj. 19, apert. alt. 10, lat. 8 Mill. The figure of Wood-Mason and 

 Alcock, has the same diameter but is only 19 Mill, in height, the upper corner of the aperture 

 in the figure, looks as if the suture should be canaliculate, but not so in the specimens. The 

 shell is not so lustrous as the authors say. They suggest that "the glistening metallic lustre of the 

 whole exterior is largely though not entirely due to the erosion of the delicate external layer of 

 the shell". In the ''Siboga"-specimens the whole shell, perhaps with exception of the embryonic 

 whorls, is covered by a thin yellowish layer, having the aspect of an epidermis, and only when 

 this is removed, the metallic lustre appears. The basal carinae, if not eroded, are not smooth, 

 in the majority of the specimens; there are only 3 of them, and a trace of an intermediate one 

 near the aperture, the most central keel is decidedly adorned with small tubercles and also the 

 other ones are slightly beaded or crenulated. The outer layer of the shell has a fibrous texture, 

 in the interstices between the umbilical keel and the second basal keel, the surface has distinct 

 riblike striae. The funnel-shaped, pervious umbilicus has the same riblike striae on its wall. The 

 only specimen from Stat. 76 has a fourth basal keel, but the upper row of tubercles is wanting 

 on the last whorl. 



After comparing a specimen of Basilissa aethiopica v. Martens (Die beschalten Gastrop. 

 d. deutsch. Tiefsee-Exp. 1898 — 99, p. 125, PI. 4, fig. 20) I think this form cannot be separated 

 as a good species from S. metallica^ for the distinctive characters which v. Martens has observed 

 may be ascribed to the condition of the shell described by Wood-Mason and Alcock and to 

 their figure. B. aethiopica is a larger, more developed form and should, as far as I can see, 

 have only a varietal rank. 



10. Solariellopsis sp. 



Stat. 88. o°34'.6N., II9°8'.5E. 1301 M. Fine grey mud. i Spec. 



One specimen of a shell, too much worn for description, may belong to the genus 

 Solariellopsis^ and may be allied to the next species, it seems to be more conical, with a less 

 canaliculate suture and a very narrow umbilicus. I have made mention of it, only on account 

 of the great depth where it has been found. - 



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